roosevelt who started putting that in and every president since franklin roosevelt has just said it but it's not constitutionally mandated. >> you know, scott, barack obama is the first president since franklin roosevelt to now have taken the oath four times. because he took it twice in 2009, because the chief justice sort of misstated part of it. and they were afraid for legal reasons, he came back the next day and took it. and then, of course, he took it yesterday, because january 20th is the day that the constitution says you have to take it. and then repeated it again today. only fdr has taken it that many times. >> so president obama has made history again, fdr, of course, was elected four times and had to take the oath four times but the president has taken it four times for the reasons you just stated. the 20th amendment of the constitution sets january 20th as the day that the president must take the oath. must take the oath by noon on january 20th. but because it fell on sunday, they decided to put off all of the official ceremonies to today. but the president was sworn in yest